The air intake on the old BTCC wagons was HUGH - a cone the size of the grille almost!

But, a lot of people toss out an old paper filter and put in a K&N and a cold air kit and think that they have a lot more zip.

If you really want to tell how you did, first get your car to stage I, then do a few speed runs with hearing protectors on. (Hey the speed run is illegal, so hearing protectors ((ear muff style)) are not really bad) Bring a friend to listen for trouble - THEN put your stuff on and do the speed runs again.

Getting back to my first comment - the air intake on my '96 855R is less than 8 square inches - less than 4" x 2" and it IS a cold air intake. I think that it goes pretty good!

There is more to producing power than an air intake - for instance gas speed in the entire system has to be within certain limits to produce the best power - notice how small the pipes actually are on high powered motorcycles.
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'96 855R,'64 PV544 driver, '67 P1800 basket case, '95 855, '95 854, the first three are mine, heh, heh, 485,000 miles put on 9 bricks